Clean Water-Cooled Condenser; Prepare Unit For Storage - Thermo Scientific 902 Operating And Maintenance Manual

Section 4
Maintenance
Clean Water-cooled
Condenser
CIP (Clean-In-Place) Procedure
Prepare Unit for
4-2 Model 900 and 5900 Series
It is recommended that the water-cooled condenser be cleaned at least once
a year, more frequently when environmental conditions are relatively high
in particulates. The water-cooled condenser can be cleaned-in-place by
using the CIP procedure below. Cleaning solutions can be used, depending
on type of deposits or build-up to be removed. Follow manufacturer
precautions.
Note Do not use liquids corrosive to stainless steel or the brazing material
(copper or nickel). Do not use hydrochloric acid or muriatic acid.
1. Disconnect the unit from the water supply.
2. Drain the unit.
3. Rinse with fresh water and drain the unit again.
4. Fill with fresh water.
5. Add cleaning agent (solution and concentration dependent on deposits
or build-up).
6. Circulate cleaning solution (if feasible).
7. Drain the cleaning solution.
8. Add and circulate a passivating liquid for corrosion inhibition of plate
surfaces.
9. Drain this liquid.
10. Rinse with fresh water and drain.
11. Reconnect the water supply and fill the unit.
12. Return to service.
Defrost the unit as described in 'Defrost Chamber'. This will prepare the
unit for storage. Turn off the freezer power switch and disconnect unit
Storage
from the power source. Turn off the battery power switch (O).
Note If the unit has been
in service, turn it off and
disconnect the power
cord connector before
proceeding with any
maintenance.
Battery power
switch
Thermocouple
interconnect jack
Battery mounting
s
bracket
Figure 4-2. Battery Power Switch
s
O O
Freezer battery
and optional BUS battery
Thermo Scientific